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You searched for subject:(Quasi Static Fracture). Showing records 1 – 3 of 3 total matches.

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University of Toronto

1. Jhin, Minseok. Crack Growth Rate and Crack Path in Adhesively Bonded Joints: Comparison of Creep, Fatigue and Fracture.

Degree: 2012, University of Toronto

The relationship between crack path and test method was examined by comparing the performance of adhesive-adherend combinations (six) in quasi-static fracture, mixed-mode fatigue, and creep crack growth. Crack paths in creep and quasi-static fracture were similar due to similar crack-tip plastic zone sizes in the epoxy adhesive even though the crack growth rates in creep were much smaller. Under condensed moisture and mixed-mode, creep and threshold fatigue tests produced interfacial failure. Under room-temperature dry environment, near threshold mixed-mode fatigue was interfacial, but was not in creep or quasi-static fracture. Smaller plastic zone size and crack path proximity to the interface that followed increased the sensitivity of near threshold, mixed-mode fatigue to surface properties. Therefore, the interfacial or cohesive failure of an adhesive system, which may judge the quality of the bond, can be a function of the test being conducted and may not be an absolute indicator of joint quality.

MAST

Advisors/Committee Members: Spelt, Jan K., Papini, Marcello, Mechanical and Industrial Engineering.

Subjects/Keywords: Adhesive Joints; Fracture Mechanics; Crack Path; Plastic Zone; Creep Crack Growth; Fatigue; Quasi-Static Fracture; Test Method; Crack Growth Rate; 0548

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APA (6th Edition):

Jhin, M. (2012). Crack Growth Rate and Crack Path in Adhesively Bonded Joints: Comparison of Creep, Fatigue and Fracture. (Masters Thesis). University of Toronto. Retrieved from http://hdl.handle.net/1807/33256

Chicago Manual of Style (16th Edition):

Jhin, Minseok. “Crack Growth Rate and Crack Path in Adhesively Bonded Joints: Comparison of Creep, Fatigue and Fracture.” 2012. Masters Thesis, University of Toronto. Accessed September 23, 2019. http://hdl.handle.net/1807/33256.

MLA Handbook (7th Edition):

Jhin, Minseok. “Crack Growth Rate and Crack Path in Adhesively Bonded Joints: Comparison of Creep, Fatigue and Fracture.” 2012. Web. 23 Sep 2019.

Vancouver:

Jhin M. Crack Growth Rate and Crack Path in Adhesively Bonded Joints: Comparison of Creep, Fatigue and Fracture. [Internet] [Masters thesis]. University of Toronto; 2012. [cited 2019 Sep 23]. Available from: http://hdl.handle.net/1807/33256.

Council of Science Editors:

Jhin M. Crack Growth Rate and Crack Path in Adhesively Bonded Joints: Comparison of Creep, Fatigue and Fracture. [Masters Thesis]. University of Toronto; 2012. Available from: http://hdl.handle.net/1807/33256


Addis Ababa University

2. Mulugeta, Habtemariam. Fracture Analysis of Pressure Vessel under Dynamic Loading and Thermal Effect .

Degree: 2012, Addis Ababa University

Pressure vessel system has an extremely broad range of application, from simple storage vessels to complicated reactor pressure vessels. The causes of failure in pressure vessels are mainly related to fracture. To avoid appalling failure, it is important to study their fracture characteristics at the design stage and even during operation for maintenance process. The thesis work has investigated the fracture behavior of pressure vessels under dynamic loading. The pressure vessel is modeled for longitudinal, circumferential and edge cracks for thin and thick walled pressure vessels. The solution to the equation of motion is obtained by transient analysis and finite element method employing a twenty-node brick element. The model is developed and analyzed using ANSYS. The study includes dynamic fracture analyses for longitudinal, circumferential and edge cracks, to obtain dynamic stress intensity factor. Also included are the stress and deflection analysis as time response. The validity of the results obtained from the research is verified by comparing with results obtained for numerical static analysis with analytical solution and previously published by other researchers, and good agreement is obtained. Advisors/Committee Members: Dr. Alem Bazezew (advisor).

Subjects/Keywords: Dynamic Stress Intensity Factor; Quasi-static Stress Intensity Factor; Stress Wave; Thermal Shock; Dynamic Fracture Analysis; Dynamic Loading; Crack; Pressure Vessel

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APA (6th Edition):

Mulugeta, H. (2012). Fracture Analysis of Pressure Vessel under Dynamic Loading and Thermal Effect . (Thesis). Addis Ababa University. Retrieved from http://etd.aau.edu.et/dspace/handle/123456789/4581

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16th Edition):

Mulugeta, Habtemariam. “Fracture Analysis of Pressure Vessel under Dynamic Loading and Thermal Effect .” 2012. Thesis, Addis Ababa University. Accessed September 23, 2019. http://etd.aau.edu.et/dspace/handle/123456789/4581.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7th Edition):

Mulugeta, Habtemariam. “Fracture Analysis of Pressure Vessel under Dynamic Loading and Thermal Effect .” 2012. Web. 23 Sep 2019.

Vancouver:

Mulugeta H. Fracture Analysis of Pressure Vessel under Dynamic Loading and Thermal Effect . [Internet] [Thesis]. Addis Ababa University; 2012. [cited 2019 Sep 23]. Available from: http://etd.aau.edu.et/dspace/handle/123456789/4581.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Mulugeta H. Fracture Analysis of Pressure Vessel under Dynamic Loading and Thermal Effect . [Thesis]. Addis Ababa University; 2012. Available from: http://etd.aau.edu.et/dspace/handle/123456789/4581

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation


Delft University of Technology

3. Meng, C. Interaction between Hydraulic Fracturing Process and Pre-existing Natural Fractures.

Degree: 2010, Delft University of Technology

Hydraulic fracturing is employed as a stimulation treatment by the oil and gas industry to enhance the hydro-carbon recoveries. The rationale is that by creating fractures from the wellbore into the surrounding formations, the conductivity between the well and reservoir is significantly increased and the hydro-carbon flow is therefore stimulated. The hydraulic fracture is initiated and driven by pressurizing a bore-hole section via fluid injection. Despite its half century’s practice, hydraulic fracturing treatments sometimes fail to increase the well productivity. One prominent reason is that there are pre-existing (natural) fractures in connection with the wellbore or in the way of the hydraulic fracture propagation. If the natural fracture is opened by the injection fluid, the borehole pressure will decrease as if a hydraulic fracture break-down has taken place. If a hydraulic fracture is intercepted by natural fractures that layer the formation, its dimension could be restricted in only one of the layers. In both of the cases, the fluid losses via the natural fractures could mislead the interpretation of the bore-hole measurements. Laboratory tests were design to investigate the interaction between the hydraulic fracturing process and natural fractures’ fluid infiltration. To characterize the natural fractures’ mechanical and hydraulic properties under normal confining and shear, we performed shear and flow tests with rock samples cleaved into layers. To characterize the hydro-natural fracture interaction, we performed the injection fracturing tests on the layered samples. We interpreted the test results by correlating the possibility of the hydraulic fracture crossing-over natural fractures with the test conditions. We concluded from the test results that if the natural fracture is closed by the normal stress significantly higher than the minimum in-situ stress, it is then likely to be crossed by the hydraulic fracture. Tests were facilitated by a tri-axial set-up in combination with an acoustic monitoring system. The tri-axial loadings maintained the samples’ in-situ stresses which determined the hydraulic fracture orientations. The monitoring system tracked the fracture propagation by converting the diffraction signal arrival times to the fracture tip locations via a velocity model. Comparisons between the recovered fractures from the acoustic monitoring and sample postmortems showed agreement. In modeling the fracture initiation and propagation, we introduced a quasi-static numerical algorithm that coupled the 2D fluid domain and 3D matrix domain via boundary conditions. The model was extended to include a layer interface (natural fracture) transverse to the bore-hole. As a result of the fluid infiltration into the interface, the coupling between the layers was weakened. The displacement loss across the interface was related to the weakening process when the hydraulic fracture met the interface. The model results showed discontinuities across the interface in the fracture width and injection fluid… Advisors/Committee Members: Currie, P..

Subjects/Keywords: hydraulic fracture; pre-existing fracture; tri-axial set-up; acoustic monitoring; quasi-static; linear-slip; solid-fluid coupling

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6th Edition):

Meng, C. (2010). Interaction between Hydraulic Fracturing Process and Pre-existing Natural Fractures. (Doctoral Dissertation). Delft University of Technology. Retrieved from http://resolver.tudelft.nl/uuid:d948cb7a-c71e-49d1-a3d7-08d4d3ec3897 ; urn:NBN:nl:ui:24-uuid:d948cb7a-c71e-49d1-a3d7-08d4d3ec3897 ; urn:NBN:nl:ui:24-uuid:d948cb7a-c71e-49d1-a3d7-08d4d3ec3897 ; http://resolver.tudelft.nl/uuid:d948cb7a-c71e-49d1-a3d7-08d4d3ec3897

Chicago Manual of Style (16th Edition):

Meng, C. “Interaction between Hydraulic Fracturing Process and Pre-existing Natural Fractures.” 2010. Doctoral Dissertation, Delft University of Technology. Accessed September 23, 2019. http://resolver.tudelft.nl/uuid:d948cb7a-c71e-49d1-a3d7-08d4d3ec3897 ; urn:NBN:nl:ui:24-uuid:d948cb7a-c71e-49d1-a3d7-08d4d3ec3897 ; urn:NBN:nl:ui:24-uuid:d948cb7a-c71e-49d1-a3d7-08d4d3ec3897 ; http://resolver.tudelft.nl/uuid:d948cb7a-c71e-49d1-a3d7-08d4d3ec3897.

MLA Handbook (7th Edition):

Meng, C. “Interaction between Hydraulic Fracturing Process and Pre-existing Natural Fractures.” 2010. Web. 23 Sep 2019.

Vancouver:

Meng C. Interaction between Hydraulic Fracturing Process and Pre-existing Natural Fractures. [Internet] [Doctoral dissertation]. Delft University of Technology; 2010. [cited 2019 Sep 23]. Available from: http://resolver.tudelft.nl/uuid:d948cb7a-c71e-49d1-a3d7-08d4d3ec3897 ; urn:NBN:nl:ui:24-uuid:d948cb7a-c71e-49d1-a3d7-08d4d3ec3897 ; urn:NBN:nl:ui:24-uuid:d948cb7a-c71e-49d1-a3d7-08d4d3ec3897 ; http://resolver.tudelft.nl/uuid:d948cb7a-c71e-49d1-a3d7-08d4d3ec3897.

Council of Science Editors:

Meng C. Interaction between Hydraulic Fracturing Process and Pre-existing Natural Fractures. [Doctoral Dissertation]. Delft University of Technology; 2010. Available from: http://resolver.tudelft.nl/uuid:d948cb7a-c71e-49d1-a3d7-08d4d3ec3897 ; urn:NBN:nl:ui:24-uuid:d948cb7a-c71e-49d1-a3d7-08d4d3ec3897 ; urn:NBN:nl:ui:24-uuid:d948cb7a-c71e-49d1-a3d7-08d4d3ec3897 ; http://resolver.tudelft.nl/uuid:d948cb7a-c71e-49d1-a3d7-08d4d3ec3897

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